76 lines
1.8 KiB
JavaScript
76 lines
1.8 KiB
JavaScript
import ImageRegion from './ImageRegion.mjs';
|
|
import {subtract} from './Composition.mjs';
|
|
|
|
describe('Composition', () => {
|
|
let inputA = null;
|
|
let inputB = null;
|
|
|
|
beforeEach(() => {
|
|
inputA = ImageRegion.fromValues(2, 2, [
|
|
0, 1,
|
|
0, 1,
|
|
]);
|
|
inputB = ImageRegion.fromValues(2, 2, [
|
|
0, 0,
|
|
1, 1,
|
|
]);
|
|
});
|
|
|
|
describe('subtract', () => {
|
|
it('returns a new image of the same size', () => {
|
|
const output = subtract(inputA, inputB);
|
|
|
|
expect(output).not.toBe(inputA);
|
|
expect(output).not.toBe(inputB);
|
|
expect(output.width).toEqual(inputA.width);
|
|
expect(output.height).toEqual(inputA.height);
|
|
expect(output.dim).toEqual(inputA.dim);
|
|
expect(output.values).not.toBe(inputA.values);
|
|
expect(output.values).not.toBe(inputB.values);
|
|
});
|
|
|
|
it('uses the given target if specified', () => {
|
|
const output = subtract(
|
|
inputA,
|
|
inputB,
|
|
{target: inputA}
|
|
);
|
|
|
|
expect(output).toBe(inputA);
|
|
});
|
|
|
|
it('calculates the difference for each pixel', () => {
|
|
const output = subtract(inputA, inputB);
|
|
|
|
expect(output.get(0, 0)).toEqual(0);
|
|
expect(output.get(1, 0)).toEqual(1);
|
|
expect(output.get(0, 1)).toEqual(-1);
|
|
expect(output.get(1, 1)).toEqual(0);
|
|
});
|
|
});
|
|
|
|
describe('ImageRegion.subtract', () => {
|
|
it('is added to the ImageRegion prototype', () => {
|
|
expect(inputA.subtract).toEqual(jasmine.any(Function));
|
|
});
|
|
|
|
it('invokes subtract', () => {
|
|
const output = inputA.subtract(inputB);
|
|
|
|
expect(output.get(0, 1)).toEqual(-1);
|
|
});
|
|
});
|
|
|
|
describe('ImageRegion.difference', () => {
|
|
it('is added to the ImageRegion prototype', () => {
|
|
expect(inputA.difference).toEqual(jasmine.any(Function));
|
|
});
|
|
|
|
it('invokes abs(subtract)', () => {
|
|
const output = inputA.difference(inputB);
|
|
|
|
expect(output.get(0, 1)).toEqual(1);
|
|
});
|
|
});
|
|
});
|